The Iranian Foreign Minister Mohammad Javad Zarif (C) arrives for lunch with the Vice President of the European Commission at the Iranian Embassy during the 5+1 talks (the five permanent members of the UN Security Council China, US, France, Britain and Russia plus Germany) with Iran in Vienna on November 18, 2014. Zarif insisted a nuclear deal remained possible as he arrived for a final round of talks with world powers, with differences still wide just six days before a deadline to strike an agreement. AFP PHOTO / JOE KLAMARJOE KLAMAR/AFP/Getty Images